Internal combustion engine



FIG. 1 is a front elevational view of an Internal combustion engineshowing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view tereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for an internal combustion engine, as shown anddescribed.